Minesweeper

Clear the mines! Expose squares one at a time by clicking on them.
If the square you click on is vacant,
you'll get to see how many of its neighbors have mines in them (0 through 8);
but if the square has a mine in it, all the mines will explode.

Shift-click (or right-click) on a square to flag it as a suspected mine.
Do it again to mark it as questionable, and again to clear the mark.

When you've exposed all the vacant squares, you win.
If a mine explodes, you lose.
Click on the face to start a new game.

The left-hand counter shows the number of mines less the number of squares
that you've flagged (correctly or not).